Xamarin形成PCL浮动按钮和可扩展视图

Question

如何在Xamarin Forms中实现类似于以下链接的内容？

paste0("VAL", c(sapply(1:3, paste0, 1:2)))
#[1] "VAL11" "VAL12" "VAL21" "VAL22" "VAL31" "VAL32"

On clicked it zoom the view