Hi Stefan,
Thanks for contacting Syncfusion support.
In order to achieve your requirement, we suggest you to customize the Diagram’s TextTool and override the ActionComplete() method without calling the base method. Please refer to the below code example and sample.
Code example:
[C#]
protected override void ActionComplete(Node nodeInserted)
{
////Dont call to base class method it will activate the texteditor....
//base.ActionComplete(nodeInserted);
}
Sample:
Regards,
Naganathan K G