private void toolStripButton1_Click(object sender, EventArgs e)
{
if (toolStripButton1.Text == "Expand All")
{
trvBlockSet.ExpandAll();
toolStripButton1.Text = "Collapse All";
toolStripButton1.Image = Properties.Resources.gem_remove;
}
else
{
trvBlockSet.CollapseAll();
toolStripButton1.Text = "Expand All";
toolStripButton1.Image = Properties.Resources.add_small;
}
}