Windows Phone tool kit bug

Windows phone tool kit 中PhoneTextBox控件有个bug,就是当从输入状态切换失去焦点时，再次进入输入状态时字体颜色会变浅，并且无法恢复。产生这个bug的原因是输入框的状态未及时改变回编辑状态。解决办法：

找到控件源码，在函数UpdateHintVisibility()中 ActualHintVisibility = Visibility.Collapsed;的后面添加Foreground = ForegroundBrushEdit;

即添加后的代码：

private void UpdateHintVisibility()

{

　　if (HintContent != null)

   {

     if (string.IsNullOrEmpty(Text))

     {

     　　ActualHintVisibility = Visibility.Visible;

        Foreground = ForegroundBrushInactive;

     }

     else

     {

       ActualHintVisibility = Visibility.Collapsed;

       Foreground = ForegroundBrushEdit;// Dokay add

     }

   }

}