title: WPF DataGridTextColumn Can't type point for float data
body: <p>I had a WPF DataGrid and use DataGridTextColumn Binding to a Collection. The items in Collection had some float property.</p>
  
  <p>When my program launched, I modify the value of float property in DataGrid, if I type a integer value, it works well. But if I type char . for a float value, char . can't be typed. I had to type all the numbers first, and then jump to the . position to type char . to finish my input.</p>
  
  <p>So how can I type . in my situation?</p>
  
  <p>Thanks.</p>