Creating a "toolbox" - how would I code this efficiently?

programming flash
1

I really have no idea how to ask this question, but I’ll try anyway.

A project I’m helping out with requires multiple tools (like the various types of pen and brush tools in most paint programs).

The tools are things like
>Create wall tool
>Create room tool
>Resize tool
>Move tool
>Delete tool
>Pan tool
etc.

I have no idea how to code this, though.

Something like this would be REALLY inefficient, cluttered, and difficult to add tools to:

//This function is run every time the mouse is down (duh)
function onMouseDown(ev:MouseEvent)
{
   select case (currentTool)
   {
      case wallTool : 
          ...
      case roomTool : 
          ...
      case moveTool : 
          ...
      // etc.
   }
}

//Same for the following functions
function onMouseUp() { ... }
function onMouseMove() { ... }

And I want to make it easy to add new tools without hassle.

Any ideas?