Bug 144378 There is no checkbox for user to bind a dynamic image
Description: Create a dynamic image, there is no checkbox for user to bind the column of dataset. Steps to reproduce: 1.Create a sample datasource and dataset with "select * from CLASSICMODELS.PRODUCTLINES". 2.Add a image to the report layout, select dynamic image type, and then click "Binding" button, select the dataset, and want to bind a column. But there is no checkbox for user to do this action. Expected result: Like data item, there is a checkbox for user to bind the column.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ColumnBindingDialog.java
else
		{
			btnDel.setEnabled( false );
			if ( btnEdit != null )
				btnEdit.setEnabled( false );
		}
		bindingTable.getTable( ).select( selectIndex );
	}
	private ComputedColumnHandle getSelectColumnHandle( )
	{
		if ( selectedColumnName != null )
		{
			for ( int i = 0; i < bindingTable.getTable( ).getItemCount( ); i++ )
			{
				ComputedColumnHandle handle = (ComputedColumnHandle) bindingTable.getElementAt( i );
				if ( selectedColumnName.equals( handle.getName( ) ) )
				{
					return handle;
				}
			}
		}
		return null;
	}
	private void updateSelection( )
	{
		if ( canSelect )
		{
			( (CheckboxTableViewer) bindingTable ).setAllChecked( false );
			( (CheckboxTableViewer) bindingTable ).setGrayed( dummyChoice, true );
			if ( getSelectColumnHandle( ) != null )