Bug 198504 The same name aggregation should be hint in dialog[0001]
Description: The same name aggregation should be hint in dialog[0001] Step: 1.New a datasource, dataset, table and binding the dataset. 2.New a aggregation column binding on table named aggr1. 3.Drop a aggregation item into table and set the named as aggr1. 4.Click OK Actual result: Pop up an error message said that the name is exist. Expected result: It can hint in dialog when input the same name, but pop up an error dialog
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/BindingDialogHelper.java
if ( getBindingHolder( ) instanceof ListingHandle )
		{
			ListingHandle listingHandle = (ListingHandle) getBindingHolder( );
			String[] groups = new String[listingHandle.getGroups( ).getCount( )];
			for ( int i = 0; i < groups.length; i++ )
			{
				groups[i] = ( (GroupHandle) listingHandle.getGroups( ).get( i ) ).getName( );
			}
			return groups;
		}
		return new String[0];
	}
	private void setDataFieldExpression( String expression )
	{
		this.expression = expression;
		if ( expression != null )
		{
			if ( cmbDataField != null && !cmbDataField.isDisposed( ) )
			{
				cmbDataField.setText( expression );
			}
			if ( txtExpression != null && !txtExpression.isDisposed( ) )
			{
				txtExpression.setText( expression );
			}
		}
	}
	private void setName( String name )
	{
		this.name = name;