Hello,
I am a new guy in QNX,so maybe this question is stupid!!
What’s the difference with Pane,Container,OSContainer??
thank’s a lot!! 
PtContainer is an abstract widget with no visual components. It’s used as a superclass for other widgets providing ‘collection like’ capabilities to its descendants.
PtPane is a PtContainer derivative which provides for a collection of widgets but also provides a visual border (and clipping rectangle) around those widgets.
PtOSContainer is similar to a pane in that it provides a collection for widgets but it causes its children widgets to draw ‘OffScreen’ - this offscreen rendering is then blitted to the video ram providing for smooth, usually, flicker free animations. All automagically of course.
Thank you for your powerful answer, and may I ask some questions more!!
In your reply, what is superclass?? and what is visual border ??
Hope your answer, thx!!
Widgets are built on a heirarchy or tree structure. They are a little like C++ classes. The most basic widget is called PtWidget. All other widgets are built on top of this. Widgets inherit properties from all widgets below them. The widgets below a widget, are sometimes know as their superclass. This terminology probably comes from C++ class structure.
A visual border is just what it sounds like. You get a border that you can see around the widget that is a few pixels wide and a different color. I think the panel border is beveled, which is just a color scheme that makes the widget look 3-D.
Thank you for your powerful answer again!!!
It’s really halp me very much, thank you!! 