private void resizeToolStripMenuItem_Click(object sender, EventArgs e)
{
Size thisSize = new Size(currentMap.width, currentMap.height);
using(ComposedForm form = new ComposedForm("Resize map", ComposedForm.Parts.Size)) {
form.SetSize(thisSize);
if (form.ShowDialog() == DialogResult.OK) {
Size newSize = form.GetSize();
if (thisSize != newSize) {
currentMap.Resize(newSize.Width, newSize.Height);
}
mainPanel.Invalidate();
}
}
}