In my B4A App I selected CheckBox by using AddView-> CheckBox in Visual Designer. I got the green check mark CheckBox. Recently I downloaded a B4A example in which I added a CheckBox the same way, I found the CheckBox is a nice blue background with white check mark as in the pic below. I tried to have the blue CheckBox in my App, but I always get the green one. The B4A version is same, the Android (V8.1) phone is same. I compared manifest files, the minSdkVer is "4", "26" in my app. In the example it is "4", "64". I changed my App to be "64" but it didn't make difference. Could anyone give me some hint how to get the blue checkbox in my App? Thanks.