Add a variable value change event
    Add and configure a variable value change event to display a dialog box when a variable value changes.
     TIP: 
    Instead of using a change event, you can also configure a transition event. For more information about events, see Events.
- InProject view, selectMainWindow (type).
- InEvents, selectand select 
- Next toVariable1Changed/VariableValueChangedEvent, selectand select . 
- Under , create a dynamic link betweenDialogand .
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