I further researched this and it seems that it would not be possible to achieve the desired behavior using the Conditional control.
A possible solution would be to create a custom Navigation widget that extends the built-in Navigation widget. Then you will be able to access the Title property which is in the widget designer using this.Title and also the SitefinityLabel control that displays this property using this.TitleLabel.
In order to do this please perform the bellow steps:
1. Open the project in Visual Studio
2. Create a class that inherits from the LightNavigationControl class which is the built-in navigation widget class
3. Override the InitializeControls() and call the base.InitializeControls() method.
4. Add your custom logic for setting the value of the SitefinityLabel control to the Title property from the designer
Here is a sample for your convenience:
LightNavigationControlCustom : LightNavigationControl
// sets the Title property from the designer to the TitleLabel control
// sets the default value for the Title property to the TitleLabel control
// this value will be displayed if the Title is not set in the designer
5. Build the solution
6. Register the control in the Toolboxes using Thunder as described in this article: http://docs.sitefinity.com/thunder-register-a-widget
7. Restart the application
After performing the above you will be able to drop the custom navigation widget on the page. If the Title property is not set in the widget designer the widget will display the default value that is defined in the InitializeControls() method. If you enter a value in the Title field in the designer, this value will be displayed by the SitefinityLabel control.
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