WDL-OL SetTextFromPlug not working

[clau_ste]

i have a simple knob which manage this parameter

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GetParam(oscillator_volume)->InitDouble("Volume", 0., 0., 10.0, 0.01, "%");

and a ITextControl

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IText text = IText(16, &COLOR_RED);

textControlValue = new ITextControl(this, IRECT(1115, 165, 200, 23), &text, "");
pGraphics->AttachControl(textControlValue);

In OnParamChange i writed this

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if(paramIdx == oscillator_volume) {
		char strValue[256];
		sprintf(strValue, " %f", GetParam(oscillator_volume)->Value());
		OutputDebugString(strValue);
		textControlValue->SetTextFromPlug(strValue);
}

I get the output with the right value, but it doesn't show in text, like if text didn't changed

[clau_ste]

Now it's working, I've added

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GetGUI()->SetStrictDrawing(true);

after SetTextFromPlug, by the way I'm not sure this is the right thing to do, if somebody has some advices/corrections, please tell me