issues with dragging content from wpf web browser control ?

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C#

WPF

Hi,
I am having trouble dragging text from a wpf web browser control and drop it on a button. Drag-Drop works fine if the content being dragged is a link. If the content is not a link and is some text then it doesn't work inside my application but works with wordpad, word and other text editors. If the content is some text then event handlers attached to button's DragEnter and Drop event don't get called ! I also noticed if the content is dragged from a textbox it works well. Could anybody tell me why dragging text (non-links) from a web browser control doens't work inside my application ?
Thanks, Ramki