[[ Someone want to write up something about what this [incr tcl] command does? ---- [AW] from the source code of itcl3.3: * itcl::configbody :: * * Looks for an existing public variable with the name , * and if found, tries to assign the implementation. If has * the form "@name" then it is treated as a reference to a C handling * procedure; otherwise, it is taken as a body of Tcl statements. * As far as I understand it: if you assign a public variable a value with the itcl configure command (myclass configure -myvar Hello) then first the new value is assigned to that variable and afterwards the script in configbody is evaluated additionally. It is also possible to define a config script for a variable when defining the variable: protected variable myvar hello {puts "this is the configscript of myvar"} [GWM] at last it becomes vaguely less fog encrusted, when the ptrogram (or user) changes a public variable by use fo the 'configure - newvalue' option then the configbody is called. So here is a simplified example. console show; update idletasks package require Itcl itcl::class hellobtn { ;# a button restricted to the values 0-9 public variable publicv ;# this var is adjusted using the configure -publicv... constructor {frm} { } method increm {dn} { set publicv "$dn" } } # create a sample case: set btn [hellobtn h2 .] itcl::configbody hellobtn::publicv {tk_messageBox -message "HOOP $publicv"} h2 configure -publicv bump ---- [Category Command] a part of the [incr tcl] object oriented package