Yes. On your main MDI form, wire up to the MdiChildActivated Event.
Like so:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.MdiChildActivate += new EventHandler(Form1_MdiChildActivate);
}
void Form1_MdiChildActivate(object sender, EventArgs e)
{
MessageBox.Show("Activated");
}
private void addToolStripMenuItem_Click(object sender, EventArgs e)
{
Form form2 = new Form2();
form2.MdiParent = this;
form2.Show();
}
}
And that event will fire when the child form is both activated or deactivated.
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