disappear when scrolling out of the original display window

[cyn8]

hi there,
I've a problem here. I've created a custom contro with CWnd based class with scrolling. I've also create 2 buttons, 1 for drawing a graph and another to draw the gridlines. However, when i display both of them, the gridlines only will be drawn in the original window(not include the covered area of the scrolling window). Apart from that,once i scroll out of the original window area, the gridlines also disappear. Can anybody guide me on how to solve this problem??
Thanks

[salman108]

--- Can u plz give us some more information as to what u are tryign to do ?

If u scroll the previous data is lost, unless u just redraw every thing in the ondraw().
better way is to maintain the data state in the doc class, and implement your drawing function in the onDraw(). this way u will draw only what is necessary in the right coordinates.

[cyn8]

in my program, there is an if statement in OnPaint. If a certain button is clicked, maybe bClicked=TRUE.

then in OnPaint,
if(bClicked==TRUE) DrawSomething();

However, if i include bClicked=FALSE; after the DrawSomething(),the drawings displayed in the covered area of the window will not be displayed when scrolling.

What is causing this to happen?