Bug 312859 The list of operator for Chart filter does not provide 30 visible items
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/dialogs/ChartCubeFilterConditionBuilder.java
cm = context.getModel( );
		}
		else
		{
			cm = (Chart) ( (ChartReportItemImpl) item ).getProperty( ChartReportItemConstants.PROPERTY_CHART );
		}
		return cm;
	}
	public int open( )
	{
		if ( getShell( ) == null )
		{
			
			create( );
		}
		updateButtons( );
		return super.open( );
	}
	protected void updateMessage( String s, int type )
	{
		super.setMessage( s, type );
	}
	@Override
	public boolean close( )
	{
		shutDownDteSession( );
		return super.close( );
	}
}