C# Winforms: Scrollbars without AutoScroll

Question

I have a TabPage with stuff in it. A few of my users have tiny screens on which some of that stuff does not fit. When I set AutoScroll true on the TabPage, it adds the scrollbars, as expected. However...

There is a ListBox in this TabPage. The ListBox is positioned such that clicking on it to select a ListItem causes the TabPage to scroll the entire ListBox into view, which in turn causes the click to select the wrong ListItem.

if I disable AutoScroll, the ListBox works correctly but the user has no way to scroll the TabPage.

I have tried adding panels and TableLayoutPanels and messing with various combinations of which have AutoScroll and which do not.

I have tried a DLLImport hack that forced an unstyled scrollbar onto the panel, but that scrollbar didn't do anything and it didn't look like the rest of the scrollbars in the application.

Edit: Note that some users have larger screens. On those screens, there is enough space to display the entire TabPage without scrolling, and it works correctly.

How can I get scrollbars without the auto scroll behavior?

Answer 1

Try creating a new panel control like this:

public class PanelEx : Panel {
  protected override Point ScrollToControl(Control activeControl) {
    return this.DisplayRectangle.Location;
  }
}

Put this panel inside your TabPage and set the Dock property to Fill. Put all of your controls inside that panel instead of the TabPage.