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
for ( int i = 0; i < tmp.getChildren( ).length; i++ )
			{
				setControlEnable( tmp.getChildren( )[i], bool );
			}
		}
	}
	/**
	 * Gets if the expression field is not empty.
	 */
	protected boolean isExpressionOK( )
	{
		if ( expression == null )
		{
			return false;
		}
		if ( expression.getText( ) == null
				|| expression.getText( ).length( ) == 0 )
		{
			return false;
		}
		return true;
	}
	/**
	 * Gets if the condition is available.
	 */
	protected boolean isConditionOK( )
	{
		if ( expression == null )
		{
			return false;