When the operator presses the button at run time, the graphic display that the button is on closes. If the Write on Close check box on the General tab is checked, when the button is pressed, the value specified in the Close value box (General tab) is written out to the location specified in the Connections tab.
If the graphic display that is closing is a Replace display, and display change is controlled remotely (by the data source), the display does not close.
Causes of run-time errors for the Close Display button