Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 6308)
+++ /CKEditor/trunk/CHANGES.html	(revision 6309)
@@ -83,4 +83,5 @@
 		<li><a href="http://dev.ckeditor.com/ticket/6684">#6684</a> : [Webkit] Toolbar buttons are not wrapping correctly when displaying inside table.</li>
 		<li><a href="http://dev.ckeditor.com/ticket/6703">#6703</a> : [IE] editor "focus" event not fired instance when dialog closes.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/6873">#6873</a> : Difficult to drag the resize grip of an iframe dialog.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/dialog/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 6308)
+++ /CKEditor/trunk/_source/plugins/dialog/plugin.js	(revision 6309)
@@ -1700,5 +1700,7 @@
 
 		var editor = dialog.getParentEditor();
-		var wrapperWidth, wrapperHeight, viewSize, origin, startSize;
+		var wrapperWidth, wrapperHeight,
+				viewSize, origin, startSize,
+				dialogCover;
 
 		function positionDialog( right )
@@ -1718,4 +1720,14 @@
 		{
 			startSize = dialog.getSize();
+
+			var content = dialog.parts.contents,
+				iframeDialog = content.$.getElementsByTagName( 'iframe' ).length;
+
+			// Shim to help capturing "mousemove" over iframe.
+			if ( iframeDialog )
+			{
+				dialogCover = CKEDITOR.dom.element.createFromHtml( '<div class="cke_dialog_resize_cover" style="height: 100%; position: absolute; width: 100%;"></div>' );
+				content.append( dialogCover );
+			}
 
 			// Calculate the offset between content and chrome size.
@@ -1796,4 +1808,10 @@
 			CKEDITOR.document.removeListener( 'mouseup', mouseUpHandler );
 			CKEDITOR.document.removeListener( 'mousemove', mouseMoveHandler );
+
+			if ( dialogCover )
+			{
+				dialogCover.remove();
+				dialogCover = null;
+			}
 
 			if ( CKEDITOR.env.ie6Compat )
Index: /CKEditor/trunk/_source/plugins/wsc/dialogs/wsc.js
===================================================================
--- /CKEditor/trunk/_source/plugins/wsc/dialogs/wsc.js	(revision 6308)
+++ /CKEditor/trunk/_source/plugins/wsc/dialogs/wsc.js	(revision 6309)
@@ -187,5 +187,6 @@
 			iframe = content && content.getChild( 2 );
 
-		iframe && iframe.setStyle( 'height', data.height + 'px' );
+		iframe && iframe.setSize( 'height', data.height );
+		iframe && iframe.setSize( 'width', data.width );
 	}
 });