Bug fixes and some enhacements

Fixed the tooltip bug when resources are is placed in in App.xaml. Issues #167 #248 #291 #612 

Added a few effects to "Controls.Textbox.xaml" using the newly created "IsWaitingForData" DP in "TextboxHelper.cs".
When the "TextboxHelper:IsWaitingForData" is set to true the area around the border of textbox has a beautiful pulsing effect. The color of the pulse effect is bound to the applied accent.

Fixed issue #607. Now the color is in white
![tooltip fix](https://f.cloud.github.com/assets/5506895/1185985/5e74ad30-22d9-11e3-9d88-10c67ed9617b.png)
![vs tabitem color fix](https://f.cloud.github.com/assets/5506895/1186019/8b1199a0-22db-11e3-8677-0f3736ca4d33.png)
![dark theme tooltip](https://f.cloud.github.com/assets/5506895/1186031/0e0f8b0a-22dc-11e3-8e66-8d3d05e3d952.png)