Bug 136538 chart cannot inherite table's columns binding when drag into table's group header
steps to reproduce: - create a table - define columns binding - insert a group - drag a chart into table's group header expected behavior: - chart can inherite table's columns binding actual behavior: - it simply couldn't
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/extensions/ExtendedElementToolExtends.java
if ( builder.open( handle ) == Window.CANCEL )
			{
				return false;
			}
		}
		setModel( handle );
		return super.preHandleMouseUp( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.designer.internal.ui.editors.schematic.tools.AbstractToolHandleExtends#preHandleMouseDown()
	 */
	public boolean preHandleMouseDown( )
	{
		return false;
	}
	/**
	 * Gets the builder
	 * 
	 * @return
	 */
	private IReportItemBuilderUI getbuilder( )
	{
		return ExtensionPointManager.getInstance( )
				.getExtendedElementPoint( extensionName )
				.getReportItemBuilderUI( );
	}
}