- _opacity = new wxSlider(this, wxID_ANY, opacity, 0, 100, wxDefaultPosition, wxSize(2,40), wxSL_HORIZONTAL|wxSL_LABELS, wxDefaultValidator);
+ _opacity = new wxSlider(this, wxID_ANY, opacity, 0, 100, wxDefaultPosition, wxDefaultSize, wxSL_HORIZONTAL|wxSL_LABELS, wxDefaultValidator);