If this property is set to Yes, the default script code calls the OnUpdateUIBefore or OnUpdateUIAfter event handler functions when appropriate (as determined by the OnSetUpdateMode and OnShowUI event handlers).

If this property is set to No, the default script code never calls the OnUpdateUIBefore or OnUpdateUIAfter event handler functions.

If the Maintenance Experience property (also in Project Properties of the General Information view) is set to No uninstall or maintenance, you cannot set the Update Mode Supported property to Yes.

The value of the Update Mode Supported property is detected by the following default code for the OnSetUpdateMode event handler:

    MediaGetData( MEDIA, MEDIA_FIELD_MEDIA_FLAGS, nMediaFlags, szIgnore );
    if( ! ( nMediaFlags & MEDIA_FLAG_UPDATEMODE_SUPPORTED ) ) then