Hi Belarus,
Thank you for your interest in Syncfusion Products.
If your intention is to retrieve the currently selected Tab in TabbedMDIManager, we can use Form's ActiveMdiChild property. Please refer the below code snippets that retrieves the ActiveMdiChild in a MenuItem click event.
private void selectedTabToolStripMenuItem_Click(object sender, EventArgs e)
{
MessageBox.Show("Active Document is "+this.ActiveMdiChild.Name);
}
Please refer the below sample for more details:
http://websamples.syncfusion.com/samples/Tools.Windows/F73807/main.htmPlease let me know if any concerns.
Regards,
Fathima