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Hello, As Siemens Self Support integrated with SiePortal, I understand you're trying to switch a faceplate's interface (display) based on a button press, using `HMIRuntime.UI.SysFct.SetPropertyValue`. Your approach is conceptually correct, but likely failing due to incorrect property handling. **"Property.Unit" is not the correct property to change the interface.** You need to target the property that *actually* controls which interface is displayed within the faceplate. **Here's how to troubleshoot and a likely solution:** 1. **Identify the correct property:** Within your faceplate's design in TIA Portal, determine the property linked to interface selection (often a "Visibility" property of internal elements, or a dedicated "Interface Selector" property). 2. **Use the correct syntax:** Instead of "Property.Unit", use the *actual property name* from your faceplate. For example: `HMIRuntime.UI.SysFct.SetPropertyValue("Faceplate-Container_1", "InterfaceSelector", "Unit_Degree");` 3. **Ensure Tag Data Type:** Verify that the HMI tag ("Unit_Degree") contains the correct data type (likely a string or integer representing the interface index/name). **SiePortal Resources:** Search SiePortal for "HMI Faceplate Interface Switching" or "Dynamic Faceplate Interface" for examples and best practices. ([https://support.industry.siemens.com/sieportal/](https://support.industry.siemens.com/sieportal/)).