Avoid invisible class extensions and use TrackControl directly instead
Avoid invisible class extensions and use TrackControl directly instead

hms-dbmi/higlass,hms-dbmi/higlass,hms-dbmi/4DN_matrix-viewer,hms-dbmi/4DN_matrix-viewer,hms-dbmi/4DN_matrix-viewer,hms-dbmi/higlass,hms-dbmi/higlass