Using set_param command leads to an error about “add/delete variant blocks through call-backs”

Hey guys,

i need some help with simulink. Please excuse my bad english.

I'm building an own simulink libary. I try to change a 'BlockChoice'-parameter depending on the "Radiobutton" selected to select the right hydraulic-model i want to use.

When a change appears i use the Callback/Initialization field of the mask (i tried already both) to

set_param([gcb,'some subsystems'], 'BlockChoice', 'MyChoice')

to select the right field of my "Configurable Subsystem".

When i use

get_param([gcb,'some subsystems'], 'BlockChoice')

the new choice is set correctly. When i start the simulation, simulink gives me the error

Your model tries to add/delete variant blocks through call-backs. With variant blocks we do not allow this change.

The funny thing is, when i manually "look"/navigate through all the masks, until the "Configurable Subsystem" and than start the simulation, no error accurs.

I tried an another way with

set_param([gcb,'firstChild'], 'someVariable', 'someValue')

functions to set other parameters of the childs-blocks until i reach my last block before the "Configurable Subsystem" and only the last block allow to change the value 'BlockChoice', but it doesn'thelp.

When i navigate through the children blocks and enter my "Configurable Subsystem" with the 'BlockChoice' parameter i can see that simulink is "lagging" and than changing to the right choice.

I use matlab R2016a. The library were tested on R2014b and R2015a also. Same problems.

I tried

set_param(gcs,'SimulationCommand','Update')

but my model starts to load every single time, i change something on my Mask.

Any ideas how i can tell the block, after i set the 'BlockChoice', initialize once again?

Thanks a lot