public FocusManagerImpl(DockPanel dockPanel)
{
this._mDockPanel = dockPanel;
this._mLocalWindowsHook = new LocalWindowsHook(HookType.WH_CALLWNDPROCRET);
this._mHookEventHandler = this.HookEventHandler;
this._mLocalWindowsHook.HookInvoked += this._mHookEventHandler;
this._mLocalWindowsHook.Install();
}