private void btnThemDinh_Click(object sender, EventArgs e)
{
FrmKruskalThemDinh form = new FrmKruskalThemDinh();
form.ShowDialog();
Loadz();
}
private void ThemDinhTaiViTri_Click(object sender, EventArgs e)
{
int tdx = panelMain.PointToClient(MousePosition).X;
int tdy = panelMain.PointToClient(MousePosition).Y;
FrmKruskalThemDinh form = new FrmKruskalThemDinh(tdx, tdy);
form.ShowDialog();
Loadz();
}