[#137] Allow to rename dialog buttons
[#150] Split UiInvokator for extrant Inoke method
[#149] Support message box titling
[#148] Support extesions for DialogVm: Show, Close
[#135] Make all GuiManager operation as thead safe [#146] Support Activate/Deactivate methods for window ViewModels
Bug fix: MessageBox
[#94] Support Activate/Deactivate methods in ViewModel an them functionality
[#141] Support dialog without buttons
[#140] Make Accept, Reject and Cancel method as protected
[#138] Support Closed event for DialogVm