Thanks for your fast response, but in your sample the RibbonPanelMergeContainer is creating another ToolStripTabItem, different from my sample where I am merging with an existing ToolStripTabItem (Inicio), I modified your project to simulate my problem, you just need to add the following code to your Form_Load events on the MDIChilder forms, and it will hide the options after changing MDI Forms.
private void Form2_Load(object sender, EventArgs e)
{
if (this.Controls.OfType<RibbonPanelMergeContainer>().Any())
{
foreach (var control in Controls.OfType<RibbonPanelMergeContainer>())
{
control.Text = "Home";
}
}
}