Extra Components and Controls
Here's a useful collection of scripted components and controls. They allow you to do things in Mathcad that are otherwise difficult or impossible. These also serve as examples for someone that wants to write their own. I wrote some of these, but not all of them.
See also here for functions for date and time handling that are based on scripted components:
Date Calendar and Time functions.mcd
See also here for how to save the state of controls and scripted components:
Saving the state of controls.zip
Updates:
Versions 2 through 10: Various things I didn't bother to tell anyone about 
Version 11, Jan 04 2011: Added a button to execute a series of shell (a.k.a. DOS) commands. There was already a function for this, but not a button.
Version 13, Feb 28 2013. Added scrolbars and sliders that can be either linear or logarithmic.
Version 14, Nov 14 2014. Improved the dynamically filled listboxes to take a scalar input for a single element list.
Richard