HC2 and HC lite
In the House view, find the main widget of the device (usually ending with .0) click the wrench (settings icon), on the next screen click on the Advanced tab, scroll down to find the Associations and click on the Setting Association button. Choose the Group 1 on the left side of the screen and on the right side of the screen remove the check mark under S (SC lifeline) and add it under M (MC lifeline), click save and you're done.
HC3 and HC3 lite
In the House view, find the main widget of the device (usually ending with .0) click the expand icon on the widget (two diagonal arrows), in the newly open window click on the settings (gear icon), on the next screen click on the Associations, under source endpoint delete the line, if it is set to controller (singlechannel). Now set the multichannel just above from where you delete the line you have three drop down menus. In the first one (the one at the left) choose EndPoint 0, select the Group 1 lifeline in the second one and in the third one select controller (multichannel) click on the + icon to add the association.