A timeline control for .NET (which is still under development).

              |                 |                | **MouseWheel** | Scroll vertically
              | <kbd>Ctrl</kbd> |                | **MouseWheel** | Scroll horizontally
              |                 | <kbd>Alt</kbd> | **MouseWheel** | Zoom vertically
              | <kbd>Ctrl</kbd> | <kbd>Alt</kbd> | **MouseWheel** | Zoom horizontally
              |                 |                | **Middle**     | Pan
              | <kbd>Ctrl</kbd> |                | <kbd>A</kbd>   | Select all
              | <kbd>Ctrl</kbd> |                | <kbd>D</kbd>   | Deselect all

By default, anything that intersects with the selection rectangle is selected.
If you hold Alt, anything that is contained within the selection rectangle is selected.
Holding Ctrl allows you pick single tracks in and out of the selection.
Clicking the labels at the start of a track will select all track elements on that track.

When grabbing a track item near the left or right edge and dragging that edge, the start or end of that track item is moved respectively.
When grabbing the track at any other place, the whole track item is moved.
Both resizing and moving operations always snap to full units, unless Alt is being held.