/// <summary>
/// Určí souřadnice prostoru pro buttony
/// </summary>
/// <param name="parentWidth"></param>
/// <param name="parentHeight"></param>
/// <param name="contentWidth"></param>
/// <param name="borderWidth"></param>
/// <param name="buttonsAlignment"></param>
/// <param name="x"></param>
/// <param name="y"></param>
protected void _AlignContent(float parentWidth, float parentHeight, float contentWidth, float borderWidth, ContentAlignment buttonsAlignment, out float x, out float y)
{
int borderHeight = 6;
SizeF contentSize = new SizeF(contentWidth, ButtonItemHeight);
RectangleF totalBounds = new RectangleF(borderWidth, borderHeight, parentWidth - 2 * borderWidth, parentHeight - 2 * borderHeight);
RectangleF contentBounds = contentSize.AlignTo(totalBounds, buttonsAlignment);
x = contentBounds.X;
y = contentBounds.Y;
}