Added select method to elements on LayoutTree
Added select method to elements on LayoutTree

basnijholt/holoviews,mjabri/holoviews,mjabri/holoviews,ioam/holoviews,vascotenner/holoviews,ioam/holoviews,mjabri/holoviews,ioam/holoviews,basnijholt/holoviews,basnijholt/holoviews,vascotenner/holoviews,vascotenner/holoviews