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
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/dialogs/CrosstabBindingDialogHelper.java
}
	private void setName( String name )
	{
		this.name = name;
		if ( name != null && txtName != null )
			txtName.setText( name );
	}
	private void setDisplayName( String displayName )
	{
		if ( displayName != null && txtDisplayName != null )
			txtDisplayName.setText( displayName );
	}
	private void setTypeSelect( String typeSelect )
	{
		this.typeSelect = typeSelect;
		if ( dataTypes != null && cmbType != null )
		{
			cmbType.setItems( dataTypes );
			if ( typeSelect != null )
				cmbType.select( getItemIndex( cmbType.getItems( ), typeSelect ) );
			else
				cmbType.select( 0 );
		}
	}
	private int getItemIndex( String[] items, String item )
	{
		for ( int i = 0; i < items.length; i++ )
		{
			if ( items[i].equals( item ) )
				return i;