单选题How are custom controls made？（）A By assembling existing controlsB By combining multipleXPages togetherC By creating a brand new widget from scratchD By writing the code for a brand new control
题目
单选题
How are custom controls made？（）
A
By assembling existing controls
B
By combining multipleXPages together
C
By creating a brand new widget from scratch
D
By writing the code for a brand new control