Bug 130262 [Regression]Click Data Explorer does not cancel palette insert mode
Description: Click Data Explorer does not cancel palette insert mode. Steps to reproduce: 1. Click grid in Palette, then click Data Explorer Result: Move mouse to Layout, it still keep the status of insert grid mode. By the way, after step1, if I clicked a col in dataset and drag it to Layout, the column was inserted as expected but the mouse cursor still kept the insert grid mode.
UI/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/ui/editors/MultiPageReportEditor.java
{
			setPageText( index, title );
		}
		try
		{
			page.init( createSite( page ), getEditorInput( ) );
			page.initialize( this );
		}
		catch ( Exception e )
		{
			removePage( index );
			throw new PartInitException( e.getMessage( ) );
		}
		return index;
	}
	/**
	 * Remove report editor page.
	 * 
	 * @param id
	 *            the page id.
	 */
	public void removePage( String id )
	{
		IFormPage page = findPage( id );
		if ( page != null )
		{
			removePage( page.getIndex( ) );
		}
	}
	/**