To reproduce:  
1. Add WindowsForm and RadRibbonBar 
2. Use this code snippet 
this.Text = string.Empty;
this.ControlBox = false;
this.radRibbonBar1.Text = "Example"; 
3. Run the project and you will see that title is visible in the Form and in the RadRibbonBar

Workaround: Use RadForm or RadRibbonForm and set the Text property.
If you use the WindowsForm, please use this code snippet: 
this.ControlBox = false;
this.radRibbonBar1.Text = "Example";
this.FormBorderStyle = FormBorderStyle.None;