The MapForceControlPlaceHolder control is required to host an application helper window, see also Integration at Document Level. In the code listing below, the HTML object tag is used to instantiate a control that will host the Libraries window by default (PlaceholderWindowID is 0).
<!-- create helper window placeholder control. -->
The example HTML page includes a few buttons which call the BtnHelperWindow method when clicked. The BtnHelperWindow method reassigns the PlaceholderWindowID of the control, and thus cause the ActiveX object to display a different helper window.
// specify which of the helper windows shall be shown in the placeholder control.
For the list of possible values of PlaceholderWindowID, see MapForceControlPlaceholderWindow.
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