void application_panel_PreviewTouchUp(object sender, TouchEventArgs e)
{
this.left_tab.users_listbox.signup.Background = System.Windows.Media.Brushes.LightGray;
this.left_tab.design_ideas_listbox.submit_idea.Background = System.Windows.Media.Brushes.LightGray;
this.left_tab.activities_listbox.submit_idea.Background = System.Windows.Media.Brushes.LightGray;
}