private void addMaterialToolStripMenuItem_Click(object sender, EventArgs e)
{
AddMaterialForm form = new AddMaterialForm();
form.Show();
form.SetParent(this);
}
private void AddNewMaterialButton_Click(object sender, EventArgs e)
{
AddMaterialForm form = new AddMaterialForm();
form.Show();
form.SetParent(this);
}