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
}
	private Object getDataPage( )
	{
		if ( dataPage == null || dataPage.isDisposed( ) )
		{
			dataPage = new ReportMultiBookPage( );
		}
		return dataPage;
	}
	private Object getOutlinePage( )
	{
		if ( outlinePage == null || outlinePage.isDisposed( ) )
		{
			outlinePage = new ReportMultiBookPage( );
		}
		return outlinePage;
	}
	private Object getPalettePage( )
	{
		if ( fPalettePage == null || fPalettePage.isDisposed( ) )
		{
			fPalettePage = new ReportMultiBookPage( );
		}
		return fPalettePage;
	}
	private void updatePaletteView( IFormPage activePageInstance )
	{
		if ( fPalettePage == null )
		{
			return;