Slider for HMCCU device

[ldealer]

Hallo,

is it possible to have a slide for a hmccu device (a shutter)?
I use the default attributes for this device, which includes a slider:

webCmd = control:up:stop:down
eventMap = /datapoint STOP true:stop/datapoint LEVEL 0:down/datapoint LEVEL 100:up/
cmdIcon = up:fts_shutter_up stop:fts_shutter_manual down:fts_shutter_down
substitute = LEVEL!#0-0:closed,#100-100:open;DIRECTION!0:stop,1:up,2:down,3:undefined;WORKING!(0|false):no,(1|true):yes
substexcl = control|pct
controldatapoint = LEVEL
widgetOverride = control:slider,0,10,100
stripnumber = 1
ccureadingfilter = (LEVEL|INHIBIT|DIRECTION|WORKING)
ccuscaleval = LEVEL:0:1:0:100
statedatapoint = LEVEL
ccureadingname = LEVEL:+pct

--> "widgetOverride = control:slider,0,10,100"

The webinterface shows the slider, but in AndFHEM is no slider available. Am I doing something wrong? Or is this not supported by andFHEM?