Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 5908)
+++ /CKEditor/trunk/CHANGES.html	(revision 5909)
@@ -50,4 +50,5 @@
 		<li><a href="http://dev.ckeditor.com/ticket/6153">#6153</a> : Chrome: tab focus is wrong.</li>
 		<li><a href="http://dev.ckeditor.com/ticket/6261">#6261</a> : Focus and infinite loop between multiple editors.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/6170">#6170</a> : Dedicated class names are removed from floating panels when opening another panel.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/floatpanel/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/floatpanel/plugin.js	(revision 5908)
+++ /CKEditor/trunk/_source/plugins/floatpanel/plugin.js	(revision 5909)
@@ -283,4 +283,12 @@
 							}
 
+							// Trigger the onHide event of the previously active panel to prevent
+							// incorrect styles from being applied (#6170) 
+							var innerElement = element.getFirst(),
+								activePanel;
+							if ( ( activePanel = innerElement.getCustomData( 'activePanel' ) ) )
+								activePanel.onHide && activePanel.onHide.call( this, 1 );
+							innerElement.setCustomData( 'activePanel', this );
+
 							element.setStyles(
 								{
@@ -316,4 +324,5 @@
 					this.element.setStyle( 'display', 'none' );
 					this.visible = 0;
+					this.element.getFirst().removeCustomData( 'activePanel' ); 
 				}
 			},
Index: /CKEditor/trunk/_source/plugins/panelbutton/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/panelbutton/plugin.js	(revision 5908)
+++ /CKEditor/trunk/_source/plugins/panelbutton/plugin.js	(revision 5909)
@@ -114,5 +114,5 @@
 					};
 
-				panel.onHide = function()
+				panel.onHide = function( preventOnClose )
 					{
 						if ( me.className )
@@ -123,5 +123,5 @@
 						_.on = 0;
 
-						if ( me.onClose )
+						if ( !preventOnClose && me.onClose )
 							me.onClose();
 					};
Index: /CKEditor/trunk/_source/plugins/richcombo/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/richcombo/plugin.js	(revision 5908)
+++ /CKEditor/trunk/_source/plugins/richcombo/plugin.js	(revision 5909)
@@ -240,5 +240,5 @@
 				};
 
-			panel.onHide = function()
+			panel.onHide = function( preventOnClose )
 				{
 					if ( me.className )
@@ -249,5 +249,5 @@
 					me._.on = 0;
 
-					if ( me.onClose )
+					if ( !preventOnClose && me.onClose )
 						me.onClose();
 				};