SetLayerZPos -- change the z-position of a layer (V4.6)
SetLayerZPos(layer, zpos)
This command can be used to change a layer's z-position. The z-position of the layer is its position in the hierarchy of layers. The first (i.e. backmost) layer has a z-position of 1, the last (i.e. frontmost) layer's z-position is equal to the number of layers currently present. You need to pass the new desired z-position for the specified layer to this function. The layer will then assume exactly this z-position, existing layers that are on or after this z-position will be shifted down. To move a layer all the way to the front (i.e. highest z-position), you can pass the special value 0 for the zpos argument. To move a layer all the way to the back, specify 1 in the zpos argument.

You can also pass a layer name in the zpos argument. In that case, the layer specified in the first argument will assume the z-position of the layer in the second argument.

layer whose z position shall be changed
new z position for the layer or 0 to move the layer to the highest z position

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