>Hi,
>thanks for your help. But I already try what you suggest but it's does not work. Actually in my pageframe I also use combo box and also grid. I want ,when I choose the field from the list of combo box, the list/data of the field will display in a grid.
>But when I run the form,the grid is empty and the combo box is display the list of the field of table.Any sugestion?

I assume that you have a single column Grid. You need to assign an initial value to the ControlSource of the Column that matches the initial field of the ComboBox's ControlSource value. Each time the ComboBox's value is changed, you have to reset the Column's ControlSource, and Refresh the Grid. In all probaility, you'll have to adjust the Column width, Header caption, and perhaps the COntrol's characteristics.