Index: _source/plugins/listblock/plugin.js
===================================================================
--- _source/plugins/listblock/plugin.js	(revision 3176)
+++ _source/plugins/listblock/plugin.js	(working copy)
@@ -29,6 +29,8 @@
 					{
 						pendingHtml : [],
 						items : {},
+						// List item ids in rendering sequence.
+						itemList : [],
 						groups : {}
 					};
 				},
@@ -79,11 +81,86 @@
 							this._.started = 1;
 						}
 
-						this._.items[ value ] = id;
+						this._.itemList.push ( this._.items[ value ] = id );
 
 						pendingHtml.push( '<li id=cke_', id, ' class=cke_panel_listItem><a hidefocus=true href="javascript:void(\'', value, '\')" onclick="CKEDITOR.tools.callFunction(', this._.getClick(), ',\'', value, '\');">', html || value, '</a></li>' );
 					},
-
+					
+					/**
+					 *  Get the navigator cursor of the list items.
+					 *  Note : This function is used for establish keyboard accessiblity through the list. 
+					 */
+					getCursor : function()
+					{
+						var doc = this.element.getDocument(),
+							idPrefix = 'cke_',
+							self = this,
+							itemList = self._.itemList,
+							items = self._.items;
+						
+						var getItem = function ( itemIndex )
+							{
+								return doc.getById( idPrefix + itemList[ itemIndex ] );
+							}, 
+							getItemLink = function ( itemIndex )
+							{
+								return getItem( itemIndex ).getFirst().$;
+							},
+							getItemValue = function ( itemIndex )
+							{
+								for( var i in  items )
+								{
+									if( items [ i ] == itemList[ itemIndex ] )
+										return i;
+								}
+							},
+							isHiddenItem = function( itemIndex ){
+								return getItem( itemIndex ).getComputedStyle( 'display' ) == 'none';
+							};
+						
+						return {
+							
+							currentIndex : -1,
+							
+							forward : function() {
+								this.currentIndex = this.currentIndex == itemList.length -1 ? 0 : ( this.currentIndex + 1 ) ;
+								if( isHiddenItem( this.currentIndex ) )
+									this.forward();
+							},
+							
+							back : function()	{
+								this.currentIndex = this.currentIndex <= 0 ?  itemList.length -1 : ( this.currentIndex - 1 );
+								if( isHiddenItem( this.currentIndex ) )
+									this.back();
+							},
+							
+							// Set current cursor position
+							setCursor : function( itemValue )
+							{
+								var itemId = items[ itemValue ];
+								var i, l = itemList.length;
+								for (i = 0; i < l; i++) {
+									if( itemList[ i ] == itemId )
+									{
+										this.currentIndex = i;
+										return;
+									}
+								}
+							},
+							
+							focusAtCursor : function()
+							{
+								getItemLink( this.currentIndex ).focus();
+								self.mark( getItemValue( this.currentIndex ) );								
+							},
+							
+							clickAtCursor: function()
+							{
+								getItemLink( this.currentIndex ).onclick();
+							}
+						};
+					},
+					
 					startGroup : function( title )
 					{
 						this._.close();
@@ -157,10 +234,10 @@
 
 					mark : function( value )
 					{
-						if ( !this.multiSelect )
-							this.unmarkAll();
-
+						if( this._.previousMarked )
+							this.unmark( this._.previousMarked );
 						this.element.getDocument().getById( 'cke_' + this._.items[ value ] ).addClass( 'cke_selected' );
+						this._.previousMarked = value;
 					},
 
 					unmark : function( value )
Index: _source/plugins/richcombo/plugin.js
===================================================================
--- _source/plugins/richcombo/plugin.js	(revision 3176)
+++ _source/plugins/richcombo/plugin.js	(working copy)
@@ -47,7 +47,11 @@
 		this._ =
 		{
 			panelDefinition : panelDefinition,
-			items : {}
+			items : {},
+			/**
+			 * @see {@link CKEDITOR.ui.listBlock::getCursor}
+			 */
+			listItemCursor : null,
 		};
 	},
 
@@ -100,13 +104,24 @@
 						_.committed = 1;
 					}
 					
+					_.listItemCursor = _.list.getCursor();
+					
 					var value = this.getValue();
 					if ( value )
+					{
 						_.list.mark( value );
+						
+						// Ignore initial cursor position of multiple select combo
+						if ( !this.multiSelect )
+							_.listItemCursor.setCursor( value );
+					}
 					else
 						_.list.unmarkAll();
+						
+					// Register combo key processing on CKEDITOR.ui.panel.
+					_.panel._.panel.onKeyDown = CKEDITOR.tools.bind( this.onPanelKeyDown, this );
+					_.panel.showBlock( this.id, new CKEDITOR.dom.element( $element ).getFirst(), 4 );
 					
-					_.panel.showBlock( this.id, new CKEDITOR.dom.element( $element ).getFirst(), 4 );
 				},
 				this );
 				
@@ -297,6 +312,35 @@
 		commit : function()
 		{
 			this._.list.commit();
+		},
+		
+		/**
+		 * Key navigation logic for combo panel.
+		 * @see {@link CKEDITOR.ui.panel.onKeyDown}
+		 */
+		onPanelKeyDown : function( keystroke )
+		{
+			var cursor = this._.listItemCursor;
+			switch ( keystroke )
+			{
+				case 40 :					// DOWN-ARROW
+				case 9 :					// TAB
+					cursor.forward();
+					cursor.focusAtCursor();
+					break;
+				case 38 :					// UP-ARROW
+				case CKEDITOR.SHIFT + 9 :	// SHIFT + TAB
+					cursor.back();
+					cursor.focusAtCursor();
+					break;
+				case 27 :					// ESC
+					this._.panel.hide();
+					break;
+				case 13 :					// ENTER
+				case 32 :					// SPACE
+					cursor.clickAtCursor();
+					break;
+			}
 		}
 	}
 });
Index: _source/plugins/floatpanel/plugin.js
===================================================================
--- _source/plugins/floatpanel/plugin.js	(revision 3176)
+++ _source/plugins/floatpanel/plugin.js	(working copy)
@@ -120,8 +121,8 @@
 				else
 					element.removeStyle( 'height' );
 
-				// Configure the IFrame blur event. Do that only once.
-				if ( !this._.blurSet )
+				// Configure the Panel(IFrame) events only once.
+				if ( !this._.panel._.eventInited )
 				{
 					// Non IE prefer the event into a window object.
 					var focused = CKEDITOR.env.ie ? iframe : new CKEDITOR.dom.window( iframe.$.contentWindow );
@@ -139,8 +140,19 @@
 							this.hideChild();
 						},
 						this );
-
-					this._.blurSet = 1;
+						
+					focused.on( 'keydown', function( evt ){
+						
+						// Delegate key processing to specific control types.
+						if( this.onKeyDown )
+						{
+							var keystroke = evt.data.getKeystroke();
+							this.onKeyDown( keystroke );
+							evt.data.preventDefault();
+						}
+					}, this._.panel );
+				
+					this._.panel._.eventInited = true;
 				}
 
 				// Set the IFrame focus, so the blur event gets fired.
Index: _source/plugins/panel/plugin.js
===================================================================
--- _source/plugins/panel/plugin.js	(revision 3176)
+++ _source/plugins/panel/plugin.js	(working copy)
@@ -177,7 +177,16 @@
 		block.show();
 		
 		return block;
-	}
+	},
+	
+	/**
+	 * This's a hook function provided by various panel based controls
+	 * to handle keystrokes. When a control is opening it's own block,
+	 * this function is required to be registered.
+	 * 
+	 * @param {String} keystroke The current keystroke presentaton. 
+	 */
+	onKeyDown : null
 };
 
 CKEDITOR.ui.panel.block = function( blockHolder )