>Just wonder the following weird behaviour is true. In the Refresh Method of the checkbox and textbox I have put some codes. If these controls is inside a grid, when refresh form is called only the checkbox is never get refresh. Why is that so?

Some things to check: Do the grid columns containing these controls have their ControlSource set? Is the Bound property of the columns set to .T. (this is the default). Are you sure you are changing the values of the control sources before doing the refresh (i.e., by either changing fields in the current record or by changing to a new record)?