XPUFixedLayout
From X-Plane SDK
XPUFixedLayout
WIDGET_API int XPUFixedLayout( XPWidgetMessage inMessage, XPWidgetID inWidget, intptr_t inParam1, intptr_t inParam2);This function causes the widget to maintain its children in fixed position relative to itself as it is resized. Use this on the top level 'window' widget for your window.