Force Databinding Updates

Question

User Interface is my weak point (well reports are even worse)... Anyway, I noticed that that when I bind controls to my business objects, that they only update when the control looses focus. Is there anyway you can have the data binding update per key stroke, or is the best solution just to put code in the change event to put the value into the business object? Main reason why I want to do this is because depending on a selection on another control; I want to constrain a text box value... And I hate nothing more than filling in a value, hitting OK/Save/Apply and then getting an error message saying the value in this box is wrong. I just prefer to check it per keystroke. John...