Cannot assign a new model to a combobox

Steps to reproduce:

• Open Design Studio
• Create a new project
• Create a new model "NewModel"
• Add some string in Column1 cell
• Save changes
• Drag and drop Combo Box to 2D View and select it
• In Model Editor, Assign "NewModel" to selected node
• -> In Code View, model: DataStore.NewModel is not set for ComboBox
•  Close and open the project again
• -> Assigning "NewModel" works now as expected