private void DeleteButton_Click(object sender, EventArgs e)
{
if (EntityView.SelectedIndices == null || EntityView.SelectedIndices.Count == 0) return;
var item = ItemToEnt[EntityView.SelectedItems[0]];
Content.Content.Get().Changes.Invoke((Action<bool, VMContext>)item.Entity.Delete, true, item.Entity.Thread.Context);
RefreshView();
}