Are you running Silverlight and using a Popup and a “drop-down” control like a ComboBox (or DatePicker, TimePicker, etc) as a child? You may be seeing some odd behavior when you expand the ComboBox. The “drop-down bit” ends up positioned from the left of your screen, not where it is supposed to be positioned. Hmmm. [...]

Silverlight 4 Multi-Binding Converter Enhancement
We have been using Colin Eberhardt’s MultiBinding Converter for Silverlight for quite a while now. It was great until we realized a problem. When the MultiBinding Converter was off screen (hidden), it would throw a binding error stating that it couldn’t convert null to whatever (in our case it was an integer in one converter [...]