Hi,
In c++ you cas use this code for run editor utility widget
void YourClassName::RunEditorUtilityWidget(UEditorUtilityWidgetBlueprint* EditorWidget)
{
if (EditorWidget)
{
UEditorUtilitySubsystem* EditorUtilitySubsystem = GEditor->GetEditorSubsystem<UEditorUtilitySubsystem>();
EditorUtilitySubsystem->SpawnAndRegisterTab(EditorWidget);
}
}
Or in blueprint there are tutoriel on the Wiki