private void ResizeTiles() {
if (_tilePanel == null || !OptionScalableTiles) return;
_positionLoaded = false;
// Width="195" Height="110"
var scale = 1d + ((ActualHeight - 640d) / 540d).Saturate();
if (scale < 1.3) scale = 1d;
if (Math.Abs(scale - _scale) < 0.2) return;
_tilePanel.ItemWidth = 195d * scale;
_tilePanel.ItemHeight = 110d * scale;
_scale = scale;
}