Bug 141959 Changing data set didn't clean old column bindings
Steps to reproduce: 1.Add two data sets, "ds1" and "ds2" 2.Add a table, binding with "ds1". All "ds1" column bindings generate automatically, that's good 3.Change "ds1" to None Expected result: All "ds1" column bindings should be cleaned Actual result: All "ds1" column bindings are still there. If changing to "ds2", "ds2" column bindings will be added after them.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ColumnBindingDialog.java
}
	}
	private void generateBindingColumns( ) throws SemanticException
	{
		List columnList = DataUtil.generateComputedColumns( inputElement );
		if ( columnList.size( ) > 0 )
		{
			for ( Iterator iter = columnList.iterator( ); iter.hasNext( ); )
			{
				addBinding( (ComputedColumn) iter.next( ) );
			}
		}
		refreshBindingTable( );
	}
	private void refreshBindingTable( )
	{
		bindingTable.refresh( );
		if ( canSelect )
		{
			updateSelection( );
		}
		updateButtons( );
	}
	private void updateButtons( )
	{
		boolean okEnable = false;
		if ( !canSelect || selectedColumnName != null )
		{
			okEnable = true;
		}