Use DoubleEditBox, type simple Mathematical Expression

I've created a custom IValueConverter and put it on an Editor.TextBox and that works ok. I just lose a whole lot of stuff that DoubleEditBox gives me

Hi Tom,

Unfortunately in this case, none of the editors as-is will work for you.  They are designed to only bind to a single value and don't have any support for expressions or any free-form entry.  That would require a custom control to accomplish (or what you did with TextBox) but we don't have anything in that area right now.  Sorry!

Hmm, I was afraid of that.

I've looked at the inheritance hierarchy of DoubleEditBox, and I was hoping to find a particular base class to start with. However, I'm not sure if that would be a good place to start on a custom control for this.

Do you think there is a good Actipro Editor base class I should use?  I don't know which class is doing the input filtering that DoubleEditBox has to only allow double value text input.

Hi Tom,

You should take a look at the "CustomPartEditBoxSSN" QuickStart.  That shows a good example of creating a custom part edit box.  In your case you might want the edit box to inherit TypeSpecificEditBoxBase<double> and then generate a custom part group and part that can handle your expression parsing.  You can implement ISpinnable on the part to allow spinners too, similar to the DoubleEditBox.  I hope that helps!