private void ChangeThemeClicked(object obj)
{
if (currentThemeWindow != null)
{
currentThemeWindow.Show();
return;
}
var themePopup = new ThemeSwitcher_UC()
{
DataContext = switcherVM
};
IWindow window = shell.CreateWindow(themePopup, "Switch theme");
currentThemeWindow = window;
switcherVM.CloseClicked += (s, e) => window.Close();
window.Closed += (s, e) => currentThemeWindow = null;
window.Show();
}